sandy to the massive typhoon in the philippines. 2012 will also be remembered for a series of mass shootings from aurora, arata, to the sikh temple, to be shooting in newtown, conn.. the case around trayvon martin sparked national protest after officials refused to arrest george zimmerman. president obama continues his secret drone wars. we spend the hour looking back at the moment and movements that shaped 2012. >> democratic congresswoman gabrielle giffords has announced she will step down this week. she was shot in the head last year in a shooting spree that left six people dead in tucson. >> thank you for your prayers and for giving me the time to recover. i have more work to do on my recovery, so i will do what is best for arizona. i will step down this week. >> iraqis are voicing outrage over the sentencing of the last marines charged in the 2005 massacre of 25 civilians. on tuesday, frank woodrich received no jail time. >> i was expecting the american courts would sentence the person to life in prison. he should appear and confessed to the world that he committed these crimes so that